1. LBNF 1 LBNF/DUNE – Construction Summary

2. LBNF Far Site Facilities Scope and Requirements LNG Membrane cryostat is an European technology. CERN has now a frame contract with the French firm holding the main IP. The support structure requires many mechanical items (beams, flanges, plates, …) easely available in Europe, which can also be prefabricated. Europe with ICARUS and ATLAS has the main knowledge of LAr cryogenic technologies. Several firms available in Europe and interested. Scope ElementFunding Source Excavation of 4850L detector and utility caverns and driftsDOE Surface buildings, utility infrastructure, cavern outfittingDOE LN2 cryogenic systemsDOE Four 10kt fiducial cryostatsNon-DOE LAr cryogenic systemsNon-DOE LAr and LN2 cryogenic fluids procurementDOE and Non-DOE CD-3a Scope 2

3. LBNF Far Site Facilities Scope and Requirements Scope ElementFunding Source Excavation of 4850L detector and utility caverns and driftsDOE Surface buildings, utility infrastructure, cavern outfittingDOE LN2 cryogenic systemsDOE Four 10kt fiducial cryostatsNon-DOE LAr cryogenic systemsNon-DOE LAr and LN2 cryogenic fluids procurementDOE and Non-DOE CD-3a Scope 3 CERN is doing the final design of the cryostats, in contact with the LNG industrial community. We are constructing large prototypes (-> ProtoDUNEs). CERN has accepted to finance the first cryostat construction. We have the opportunity to build a consortium with several FAs for cryostat number 2. Several EU firms can be involved. There are plenty of opportunities to participate in the engineering of the cryostats, in particular for all the penetrations to the liquid. Same for the LAr cryogenics. We could effectively use the EU knowledge and market.

4. LBNF In practice: - We need to engineer an European in-kind for the second cryostat: - involve European firms in the various procurements - more engineering effort (distributed also outside CERN) - Prepare the installation scenario (technical teams, QA teams, ….) - All this can start with teh first cryostat - We need to engineer an European in-kind for LAR cryogenics: - involve European firms - We need to strength the CERN cryogenics group - Distribute the engineering design work also outside CERN - Work out the scenarios for installation and commissioning 4